I have the Sleepcover from Kobo because I absolutely need a cover on day one, and it fits perfectly -- no extra room around the sides, very slim -- and that's really the only particularly good thing I have to say about it. The magnetic closure is weak, so if you use the Sleepcover function it turns itself on and off all the time, and there's no elastic holding it sort of shut. It's pretty ugly, with a weird plastic bit in the back. You can leave it on while connecting via usb.
If you also desperately need a fitting cover ASAP, go for it -- I probably won't replace it until it falls apart now that I have it -- but I cannot actually recommend it if there are other options.
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